Mitochondrial outer membrane is a unit membrane located at the outermost periphery of mitochondria, and its thickness is about 6-7nm. The mass ratio of phospholipid to protein is 0.9: 1, which is close to the same ratio of eukaryotic cell membrane.
Mitochondrial membrane gap is the gap between mitochondrial outer membrane and mitochondrial inner membrane, which is about 6-8nm wide and filled with amorphous liquid.
Mitochondrial intima is a unit membrane located in the outer membrane of mitochondria and wrapped by mitochondrial matrix. The mass ratio of protein to phospholipid in mitochondrial intima is about 0.7:0.3, and it contains a lot of cardiolipin.
Function of mitochondria
Mitochondria is the place where eukaryotes undergo oxidative metabolism, and it is also the place where sugar, fat and amino acids are finally oxidized to release energy. Mitochondria are responsible for final oxidation through tricarboxylic acid cycle and oxidative phosphorylation, which correspond to the second and third stages of aerobic respiration respectively.
Mitochondria can store calcium ions, and cooperate with endoplasmic reticulum and extracellular matrix to control the dynamic balance of intracellular calcium ion concentration. Mitochondria's ability to quickly absorb calcium ions makes it a buffer zone for calcium ions in cells.
Some functions of mitochondria can only be displayed in specific tissues and cells. For example, only mitochondria in liver cells have the function of detoxifying ammonia, which is a waste produced during protein's metabolism.
The above contents refer to Baidu Encyclopedia-Mitochondria